★These high-performance oil dampers were designed with M-Chassis models in mind. ★Aluminum cylinders feature a slick black coating on their mirror-surface interior. ★Fluorine resin 2- and 3-hole pistons are included. ★Soft silicone O-rings and fluorine resin spacers minimize oil leakage. ★Resin spring retainers allow setting of spring length. ★Comes with 3 hardnesses of spring.